I no longer have a boat on the south coast :-(  but it would have been
useful, if I'd had the hum then, a few years back.
I have mused that the gently persisting movements on the tide could
moderate the fixed point in space for the hearer that I suspect hum
depends on, to some extent anyway.
(Nodal effects, amongst other considerations)
Once grounded by the low tide the effect would be immediately
apparent,should absolute position be crucial in this- at least on a
minute to minute basis.
A pity no other mariners are on here that could check this out!
Whether the wind, tidal hull noise and halyard noise would completely
drown the hum is another matter!
Or, possibly- no bad thing, anyway!

On Dec 4, 11:34 am, [EMAIL PROTECTED] wrote:
> What I hear, and what I call the classic ....mmmMMMmmmMMMMmmmm, an
> electronic sounding effect, has been off. A few nights back it was
> there, but only very very faint and would of been totally
> unrecognisable had I not of been aware of what it is. It comes in
> little waves now and then, and then disappears, not like when it's
> full on turbo and the whole place throbs.  Mind you this week I'm
> rolling in at 2am, stressed, knackered and caffeined up to the
> eyeballs and not being affected by the Hum. A nice glass or two of
> pinot and dinner at 0245 fixed that, but still no Hum was detected.
> So, alcohol, caffeine, stress, tiredness are not in my case factors to
> hearing the Hum. 80 miles you say. The worst I've ever heard it is
> down in that direction - towards the south, and on the coast, so there
> could be geographical factors to consider.....
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